String.prototype.capitalize = function() {
    return this.charAt(0).toUpperCase() + this.slice(1);
}

String.prototype.trim = function() {
    return this.replace(/^\s+|\s+$/g,"");
}

String.prototype.ltrim = function() {
    return this.replace(/^\s+/,"");
}

String.prototype.rtrim = function() {
    return this.replace(/\s+$/,"");
}

String.prototype.toNumber = function() {
    return Number(this.replace(/[^0-9\.]+/g,""));
}

Number.prototype.toCurrency = function(c, d, t){
var n = this, 
    c = isNaN(c = Math.abs(c)) ? 2 : c, 
    d = d == undefined ? "." : d, 
    t = t == undefined ? "," : t, 
    s = n < 0 ? "-" : "", 
    i = parseInt(n = Math.abs(+n || 0).toFixed(c)) + "", 
    j = (j = i.length) > 3 ? j % 3 : 0;
   return s + (j ? i.substr(0, j) + t : "") + i.substr(j).replace(/(\d{3})(?=\d)/g, "$1" + t) + (c ? d + Math.abs(n - i).toFixed(c).slice(2) : "");
 };

Array.prototype.max = function( ){
    return Math.max.apply( Math, this );
};

Array.prototype.min = function( ){
    return Math.min.apply( Math, this );
};

Date.prototype.addDays = function(days) {
    this.setDate(this.getDate() + days);
    return this;
};